SoundOps

Collection of small CGI online apps to illustrate aspects of acoustic phonetics.

Input form: soundops.html

1. Butterworth filters:

• low-pass: lowpass-cgi.py
• high-pass: highpass-cgi.py
• band-pass: bandpass-cgi.py

2. Transforms:

• Fast Fourier Transform: fft-cgi.py)
• Hilbert transform (hilbert-cgi.py) to illustrate amplitude demodulation

4. Cosine windows:

• Hamming window (hamming-cgi.py)
• Hann (Hanning) window (hanning-cgi.py)

5. Spectrogram (spectrogram-cgi.py)

Input form: fm.html

• Frequency modulation (fm-cgi.py)

Input form: moddemod.html

• FM and AM modulation and demodulation (moddemod.html, moddemod-cgi.py) with modules:
  • modgf0x.py (parametrised F0 estimation)
  • modgrapt.py (wrapper for Debian distribution of David Talkin's RAPT F0 estimation)